CANNIBALISM PERFORMANCE OF ASIAN REDTAIL CATFISH (Hemibagrus nemurus) FED RATION SUPPLEMENTED WITH DIFFERENT DOSES OF 17α-METHYLTESTOSTERONE

One of the obstacles in Asian redtail catfish hatchery is high cannibalism incidence. Cannibalism associated with aggressive behavior caused by hormonal metabolism especially testosterone. The purpose this study was to evaluate effect testosterone administration on incidence juveniles. experiment conducted rearing fish initial length 4.09±0.19 cm 16 20 L aquariums a density 2 L-1. designed completely randomized design 4 treatments which were different level 17α-methyltestosterone supplementation feed, i.e., 0 mg kg-1 feed (A) as control, 7.5 (B), 15 (C), and 30 (D). Each treatment has replications. Fish fed experimental diet (40% protein) times day satiation for days. parameters observed type index cannibalism, behavior, survival rate, normal mortality, growth performance, hormones concentrations (estradiol, testosterone, cortisol), water quality. results showed that II (the eaten or missing) increased increasing doses highest 40.63%. rate found B (73.75±2.50%) not significantly from control (69.38±2.39%). No differences concentration performance among treatments. However, there trend decrease estradiol juveniles ration supplemented 17α-methyltestosterone. Based obtained research, changed body's plasma, it appears role plasma controlling It concluded affected Catfish.